Why could my 87 vw fox be leaking oil into the air filter assembly?

Oil is coming from the crankcase ventilation hose into the air filter assembly. It's the 1.8 liter four cylinder also found on Golfs and Jetta's of the time.Why could my 87 vw fox be leaking oil into the air filter assembly?your vent system is clogged. common problem with volkswagens. replace it with new and your problem should be solvedWhy could my 87 vw fox be leaking oil into the air filter assembly?i hate that car. I had 2 of them and they are by far the lamest built car in the world.Why could my 87 vw fox be leaking oil into the air filter assembly?Blow by from crankcase.

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